Does Overleaf support pTeX?

Yes, Overleaf can compile Japanese documents that require pTeX. Here's how:

1. A pTeX document does not need special commands for Japanese text (kanji, hiragana and katakana). Here's a simple example (using the jsarticle document class):

   \documentclass{jsarticle}
   
   \bibliographystyle{jplain}
   \title{p\LaTeX\ 実験}
   \author{林蓮枝}
   
   \begin{document}
   
   \maketitle
   
   \begin{abstract}
   本稿では、文書組版システムp\LaTeX{}の使い方を解説します。p\LaTeX{}を利用するときには、あらかじめ文章中に\TeX{}コマンドと呼ばれる組版用の指示を混在させ\ldots
   \end{abstract}
   
   \section{導入}
   こんにちは世界！
   
   \end{document}
   

2. If you are uploading a .tex file from elsewhere, make sure it is saved in UTF-8 encoding.
3. In the Overleaf editor, click on the Overleaf menu button above the file list panel.
4. Set the "Compiler" option to "LaTeX".
5. Add a blank file to your project, and save it as latexmkrc.
6. Add the following line to your latexmkrc file:

$latex = 'platex';
$bibtex = 'pbibtex';
$dvipdf = 'dvipdfmx %O -o %D %S';

Use the link below the following code listing to open an Overleaf project which creates a suitable latexmkrc file and typesets the LaTeX code.

main.tex

\documentclass{jsarticle}

\bibliographystyle{jplain}
\title{p\LaTeX\ 実験}
\author{林蓮枝}

\begin{document}

\maketitle

\begin{abstract}
本稿では、文書組版システムp\LaTeX{}の使い方を解説します。p\LaTeX{}を利用するときには、あらかじめ文章中に\TeX{}コマンドと呼ばれる組版用の指示を混在させ\ldots
\end{abstract}

\section{導入}
こんにちは世界！

\end{document}

latexmkrc

$latex = 'platex';
$bibtex = 'pbibtex';
$dvipdf = 'dvipdfmx %O -o %D %S';

 Open this example in Overleaf.

This example produces the following output:

See also:

• The Overleaf help page dedicated to typesetting Japanese.
• This blog post (in Japanese) by doraTeX has further details about using pTeX and upLaTeX on Overleaf.